1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// <string> 11 12// basic_string() 13// noexcept(is_nothrow_default_constructible<allocator_type>::value); 14 15// This tests a conforming extension 16 17#include <string> 18#include <cassert> 19 20#include "test_allocator.h" 21 22template <class T> 23struct some_alloc 24{ 25 typedef T value_type; 26 some_alloc(const some_alloc&); 27}; 28 29int main() 30{ 31#if __has_feature(cxx_noexcept) 32 { 33 typedef std::string C; 34 static_assert(std::is_nothrow_default_constructible<C>::value, ""); 35 } 36 { 37 typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>> C; 38 static_assert(std::is_nothrow_default_constructible<C>::value, ""); 39 } 40 { 41 typedef std::basic_string<char, std::char_traits<char>, some_alloc<char>> C; 42 static_assert(!std::is_nothrow_default_constructible<C>::value, ""); 43 } 44#endif 45} 46